Pump jack



3 Y R. 'r. CRUIKSHANK 1,784,823

PUMP JACK Filed June 7, 1929 Fatented Dec. 16, 1930 UNITED STATES.

' oss '11. onUIKsHANK, or rnnn AroL Is; MInnEso'rA I run]? JACKApplication filedJune 7, 1 929f-Seria1 K053 69336,

My invention relates to pump jacks, and an object is to provide a deviceof this class which may be readily installed for efiicient applicationof power in order to operate pumps. It has been customary heretofore tooperate pumps by means of a walking beam construction. In carrying outmy invention,

I provide a cam construction incombination with a reciprocating slidewhich causes pump links attached thereto to move up and down without anyrocking movement.

The full objects and advantages of my invention will appear inconnection with the detailed description thereof, and the novel featuresof my inventive idea will be particularly pointed out in the claims.

In the accompanying drawings which il lustrate my invention in one ofthe forms in which it may be embodied,-

Fig. 1 is a view of the device mostly in central vertical section. Fig.2 is a view in horizontal section on the line 2-2 of Fig. 1.

Fig. 3 is a view in central vertical sectionv taken at right anglesto 1. Fig. 4 is a view of a cam on a reduced scale.

As shown in the drawings, the support of the device includes ahorizontal plate 10, one side of which is rounded as indicated at 12 inFig. 2 and is provided with a leg 14 having an outturned foot 16 bywhich it may be anchored. A vertically disposed guide member 18 isprovided with horizontal flanges 20 intermediate its length which aresecured to the opposite side of the plate 10 by bolts or rivets 22. Theguide member 18 is downwardly extended to form legs 24 having feet 26which may be anchored and this guide member is provided with a verticalslot 28 which receives a slide 30. The slide 30 is" held forreciprocation in the slot 28 by a rear plate 32 gear 56, which.preferably forms part of a casting having a horizontal disk member 58provided with a hub 60. The annular gear 56v extendsjdown from'the diskmember 58 while an annular cam 62 extends up from the disk member 58,this cambeing so positioned that as it is rotated, the roller 42 is inengagement with the upper margin thereof. By referringto Fig. 4, it willbe understood that the margin of the cam consists of a downwardinclination 64 and an-upward inclination 66, the latterinclination beinmuch longer than the. other inclination. boltv 68-; passing through thehub and through the platelO serves-to holdthe combined gear and cammemberinplace for rotative movement. The lower *endof the plate .34 isturned-forwardly to provide two lugs70 and 72 to whichthe lowerend of:pump links 74fland 76 aresecured respectively by bolts 7 8 and 80. Theupper ends ofrthe links 74,and"76 are con nected-by-a crossbar 82 whosecentral portion carries two spaced lugs 84 and 86 between -which theupper end of a pump rod 88'is placed and secured by a bolt 90. The pumprod.88 operates in the usual manner in connection with apump, parts ofwhich are indicated at 92 and 94 in Fig. 1; V

"The operation and advantages of my invention will now be obvious.Theconstruc tion provides a slow' lift. withlong leverage and wit-h aquick drop. The slide30 is constrained to move up and down in the guidemember. and hence the pump links/74 and 7 6 move up and down withoutrocking move-- ment," thereby. avoiding wear. which would be caused bysuch movement. It will be understood that the contour of the cam will besuch to give thedesired ratio between the lifting and return strokes. Byreferring to Fig. 3, it will be understood that the slot 28 extends bothabove and below the plate 10 whereby the movement of the slide is acrossthe plane of the plate.

I claim:

1. A pump jack comprising a horizontal supporting plate, a verticallydisposed guide member having horizontal flanges secured to said plate,said guide member being downwardly extended to form legs and contain-100 ing a vertical slot, a slide working in said slot, front and-rearplates for holding said slide in said slot, bolts passing through saidplates and slide, one of said bolts being extended and carrying aroller, a disk member rotatably mounted on said supporting plate by avertical pivot, an annular cam extending up from said disk member andengaged by said roller, an annular gear extending down from said diskmember, a shaft rotatably r mountedbelow said annular gear,'a pinion psecured to said shaft and meshing with said annular gear, a drivingpulley secured to the outer end of said shaft, and pump linksrat;-tached to said slide. Y

' 2.- A' pump jack-comprising a horizontal supporting plate, avertically disposed guide member secured to said plate and containing avertical slot,--a slide working in said slot, front and rear plates forholding said slide in said slot, bolts passing through said plates andslide, one of said bolts being extended and carrying a roller, a diskmember rotata bly mounted on said supporting plate by a vertical pivot,an annular cam extending up from said disk member and engaged by saidroller, an annular gear extending down from said disk membeiga shaftrotatably mounted below said annulargear,'a pinion secured to said shaftand meshing with said annular gear, a driving pulley secured to theouter end of said shaft, and pumplinks attached to said slide. I

3. A pump jack comprisinga horizontal supporting plate, a verticallydisposed guide a member secured to said plate, a slide held forreciprocation on said guide, a roller extending out from said slide,adisk member rotatably mounted on said supporting plate by a verticalpivot, an annular cam extend ing up: from said disk member and engagedby said' roller, an annular gear extending down from said disk member, ashaft rotatably mounted. below said annular gear, a pinion securedtosaid shaft and meshing with said annular gear, a driving pulley securedto the outer end of said shaft, and pump links attached to said slide.

In testimony whereof signature.

a ROSS-T. CRUIKSHANK.

I hereunto affix

